Buccinum tenue, Gray. 
Beechey's Voy. 1889, Pag, 128, Pl. XXXVI, Fig. 19. 
B. scalariforme(Beck) Møller. Ind. Moll. Groenl. 1842, Pag. 84. 
Forekomst: — Stat. 326, 357, Norskøerne (20—30 
Fayne), 366, 374. Fra 20 til 125 Favne. 
I sin ydre Form er ogsaa denne Art stærkt varierende 
og Forholdet imellem Spiret og Mundaabningen vexler, fra 
Mundaabningen */s af Spiret til over Spirets Længde. I 
Regelen er Vindingerne stærkt tumide med dyb Sutur, men 
fra Magdalenebay (Stat. 366) haves et Exemplar, der i 
ydre Form ligner den almindelige B. groenlandicum, og 
Længdefoldene er kun svagt udviklet, men den eiendommelig 
fine chagrainerede Sculptur kommer dog tydelig frem. Dr. 
Leche omtaler derimod i sit oftere citerede Arbeide (Pag. 
65) en Varietet med *tydelig udviklet Kjøl” og tilføier: 
*Saavel paa Grund af denne Karakter som ogsaa ved hele 
sin Form synes denne Varietet at danne Overgang til B. 
undulatum, Møll.” (B. Donovami?). 
Om end denne Art utvivlsomt hører til de bedste 
Bucemum-Arter, saa synes ogsaa her imellem at forekomme 
Former, der tyder paa en ikke ganske ren Herkomst. 
Da nærværende Afhandling i Januar 1881 blev ind- 
leveret til Redaktionskomiteen, betragtede jeg den som 
afsluttet fra min Haand, og de mange større og mindre 
Arbeider over Buccinide, som senere er bleven offentlig- 
gjort, har jeg derfor ikke kunnet tage Hensyn til. I intet 
væsentlig har disse dog forandret mine Anskuelser saaledes, 
at jeg har fundet noget Omarbeide nødvendig, og lige saa 
lidt er de af mig opstillede nye Arter, saavidt mig bekjendt, 
beskrevet af senere Forfattere. Her skal forøvrigt oplyses, 
at Separataftryk af Plancherne allerede i August 1880 blev 
sendt til malacologiske Venner i Europa og Amerika. 
35 
Buccinum tenue, Gray. 
Beechey's Voy. 1839, p. 128, Pl. XXXVI, fig. 19. 
B. scalariforme (Beck) Möller, Ind. Moll. Groenl. 1842, p. 84. 
Habitat: — Stats. 326, 357, Norway Islands (20—30 
faths.), 366, 374 (20—125 faths.). 
This form varies, too, very considerably in its outer 
characters. The proportions between the spire and the 
aperture, for instance, vary from the aperture being two-thirds 
to more than the length of the spire. The whorls are asa rule 
very tumid, with a deep suture; but a specimen from Magdalena 
Bay (Stat. 366) resembles in its habitus the normal form 
of B. groenlandicum, the longitudinal folds being but slightly 
developed, whereas the delicate granulous secondary sculp- 
turing is distinetly perceptible. Dr. Leche mentions in his 
aforecited work, p. 65, a variety with “a distinctly devel- 
oped keel.” “Both by reason of this character and of its 
general form, the said species would appear to approximate 
B. undulatum, Moll.” (B. Donovani? ). 
Even in this, though unquestionably one of the best- 
defined species of the genus, forms do, it seems, occasionally 
occur indicating a spurious descent. 
The present Memoir having been forwarded to the 
Editorial Committee in January 1881, I considered it as 
finished from my pen, and to the numerous works on the 
Buccinide, as well extensive as brief, that have since 
appeared, I cannot therefore have due regard. None of 
these, however, have affected my views to such extent, 
that I have seen fit to re-write any portion of the Memoir; 
nor have the new species I have established, so far as I 
am aware, been described by any subsequent author. For 
the rest, I can state here, that copies of the plates were 
distributed among malacological friends in Europe and 
America as early as August 1880, 
Translated into English by John Hazeland. 
